A method of printing a holographic 3D image is provided. The method includes forming sub-voxels on a hologram recording material, the sub-voxels including one or more colors.
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17. A method of printing a holographic 3D image, the method comprising:
forming a first sub-voxel comprising a first color and a second color on a hologram recording material;
moving the hologram recording material by a distance corresponding to a size of a sub-voxel;
forming a second sub-voxel comprising the second color and a third color on the hologram recording material;
moving the hologram recording material by the distance corresponding to the size of the sub-voxel; and
forming a third sub-voxel comprising the third color and the first color on the hologram recording material.
1. A method of recording a holographic 3D image, the method comprising:
forming a first sub-voxel on a hologram recording material, wherein said forming of the first sub-voxel comprises
passing a first light through a spatial light modulator (sml); and
recording color data of the first light on the first sub-voxel of the hologram recording material;
moving the hologram recording material by a distance corresponding to a size of a sub-voxel;
forming a second sub-voxel on a hologram recording material, wherein said forming of the second sub-voxel comprises
passing a second light through the sml; and
recording color data of the second light on the second sub-voxel of the hologram recording material,
wherein each of the first and second sub-voxels consists of one or two colors.
8. A method of recording a holographic 3D image, the method comprising:
emitting a first light, a second light, and a third light from a first light source, a second light source, and a third light source, respectively;
splitting the first light into a first reference light and a first material light;
splitting the second light into a second reference light and a second material light;
splitting the third light into a third reference light and a third material light;
forming a first sub-voxel corresponding to the first material light and consisting of a first color on a hologram recording material;
moving the hologram recording material by a distance corresponding to a size of a sub-voxel;
forming a second sub-voxel corresponding to the second material light and consisting of a second color on the hologram recording material;
moving the hologram recording material by the distance corresponding to the size of the sub-voxel; and
forming a third sub-voxel corresponding to the third material light and consisting of a third color on the hologram recording material.
2. The method of
forming additional sub-voxels by iteratively repeating the forming and moving; and
forming a sub-voxel 2D array configuration comprising the first sub-voxel, the second sub-voxel, and the additional sub-voxels.
3. The method of
4. The method of
5. The method of
6. The method of
7. The method of
9. The method of
wherein the forming of the second sub-voxel comprises emitting the second material light of the second color to a second location on the hologram recording material via the SLM on which color data of the second color is displayed, and
wherein the forming of the third sub-voxel comprises emitting the third material light of the third color to a third location on the hologram recording material via the SLM on which color data of the third color is displayed.
10. The method of
wherein the light of the second color is emitted by a second laser light source, and
wherein the light of the third color is emitted by a third laser light source.
11. The method of
repeatedly and sequentially forming the first, second, and third sub-voxels to form a sub-voxel 2D array configuration.
12. The method of
13. The method of
14. The method of
15. The method of
16. The method of
18. The method of
19. The method of
20. The method of
21. The method of
repeatedly and sequentially forming the first, second, and third sub-voxels to form the sub-voxel 2D array configuration.
22. The method of
23. The method of
24. The method of
25. The method of
26. The method of
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This application claims the benefit under 35 U.S.C. §119(a) of Korean Patent Application No. 10-2011-0084820, filed on Aug. 24, 2011, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes.
1. Field
The following description relates to methods of printing holographic 3D images.
2. Description of Related Art
Recently, interest with respect to 3-dimensional (3D) stereoscopic images has been growing. As a result, development of display apparatuses configured to embody 3D stereoscopic images has increased. Research is being conducted regarding embodiment of real and natural stereoscopic images based on multi-view images. For example, when a number of view points increases, stereoscopic images become more natural, but deteriorate in quality. Therefore, since a hologram recording material has the ability to embody high-quality, real, and natural stereoscopic images, the printing of holographic 3D images is being researched.
In an example, light of a predetermined color from the light source 10 is split into a reference light 11 and a material light 21 by the beam splitter 40. The reference light 11 is incident to a predetermined location on the hologram recording material 50 via the reflection mirror 12. Further, the material light 21 is incident to the SLM 30, on which color data regarding a predetermined color is displayed, via the reflection mirror 22 and the lenses 23 and 24. The material light 21 modulated by the SLM 30 passes through the object lens 25 and is incident to the hologram recording material 50. Here, an interference pattern between the reference light 11 and the material light 21 is printed on the location at which the reference light 11 and the material light 21 are incident to the hologram recording material 50. Accordingly, when respective interference patterns for three colors, e.g., red light, green light, and blue light, are printed on the hologram recording material 50, a voxel 60, which is a unit of a 3D stereoscopic image, is formed.
The voxel 60 is a pixel in 3D space, or a volume pixel including graphic data that defines unit volume in 3D space. When the hologram recording material 50 is moved in the x-axis direction or the y-axis direction to print the interference patterns on the hologram recording material 50 in correspondence to all locations of an actual 3D image, a voxel 2-dimensional (2D) array configuration, in which a plurality of voxels 60 is 2-dimensionally arranged, is formed on the hologram recording material 50.
As described above, the general holographic 3D image printer forms the plurality of voxels 60, including graphic data regarding an actual 3D image, on the hologram recording material 50. Here, the voxels 60 include graphic data corresponding to different locations of an actual 3D image, respectively. In an example, each of the voxels 60 generally includes color data of three or more colors.
Next, after the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a voxel, the voxel formation as described above is performed. According to the example illustrated in
As described above, in a general method of printing a 3D image based on a holographic 3D image printer, a red light, a green light, and a blue light are sequentially emitted, and the SLM 30 displays respective data corresponding to the colors. As a result, color data regarding the three colors is recorded to a same voxel 60 of the hologram recording material 50 in the form of a hologram.
However, the recording process may be lengthy to complete and a brightness of a 3D image is reduced due to deterioration of diffraction efficiency (DE) of a hologram. For example, a modulated refractive index of the hologram recording material 50 is from about 10−3 to about 10−1, where the modulated refractive index is closely related to DE. In a general voxel 2D array configuration, the modulated refractive index is recorded to the voxel 60 of
In one general aspect, there is provided a method of printing a holographic 3D image, the method including forming sub-voxels on a hologram recording material, the sub-voxels including one or more colors.
The method may further include forming a sub-voxel 2D array configuration including the formed sub-voxels.
The method may further include that each of the sub-voxels includes pieces of color data that are different from pieces of color data of adjacent ones of the sub-voxels.
The method may further include that each of the sub-voxels includes different pieces of location data.
The method may further include that, in the sub-voxel 2D array configuration, odd number rows of the formed sub-voxels are shifted by a predetermined distance from even number rows of the formed sub-voxels.
The method may further include that, in the sub-voxel 2D array configuration, odd number columns of the formed sub-voxels are shifted by a predetermined distance from even number columns of the formed sub-voxels.
The method may further include that the one or more colors include red, green, blue, or any combination thereof.
In another general aspect, there is provided a method of printing a holographic 3D image, the method including forming a first sub-voxel including a first color on a hologram recording material, forming a second sub-voxel including a second color on the hologram recording material, and forming a third sub-voxel including a third color on the hologram recording material.
The method may further include that the forming of the first sub-voxel includes emitting light of the first color to a first location on the hologram recording material via a spatial light modulator (SLM) on which the color data regarding the first color is displayed, the forming of the second sub-voxel includes emitting light of the second color to a second location on the hologram recording material via the SLM on which the color data regarding the second color is displayed, and the forming of the third sub-voxel includes emitting light of the third color to a third location on the hologram recording material via the SLM on which the color data regarding the third color is displayed.
The method may further include that the light of the first color is emitted by a first laser light source, the light of the second color is emitted by a second laser light source, and the light of the third color is emitted by a third laser light source.
The method may further include, after the forming of the first sub-voxel, moving the hologram recording material by a distance corresponding to a size of a sub-voxel, and, after the forming of the second sub-voxel, moving the hologram recording material by the distance corresponding to the size of the sub-voxel.
The method may further include repeatedly and sequentially forming the first, second, and third sub-voxels to form a sub-voxel 2D array configuration.
The method may further include that the first, second, and third sub-voxels are adjacently arranged.
The method may further include that each of the first, second, and third sub-voxels include different pieces of location data.
The method may further include that, in the sub-voxel 2D array configuration, odd number rows of the formed first, second, and third sub-voxels are shifted by a predetermined distance from even number rows of the formed first, second, and third sub-voxels.
The method may further include that, in the sub-voxel 2D array configuration, odd number columns of the formed first, second, and third sub-voxels are shifted by a predetermined distance from even number columns of the formed first, second, and third sub-voxels.
The method may further include that the first, second, and third colors include red, green, and blue, respectively.
In yet another general aspect, there is provided a method of printing a holographic 3D image, the method including forming a first sub-voxel including a first color and a second color on a hologram recording material, forming a second sub-voxel including the second color and a third color on the hologram recording material, and forming a third sub-voxel including the third color and the first color on the hologram recording material.
The method may further include that the forming of the first sub-voxel includes recording color data regarding the first color and color data regarding the second color to a first location on the hologram recording material.
The method may further include that the forming of the second sub-voxel includes recording color data regarding the second color and color data regarding the third color to a second location on the hologram recording material.
The method may further include the forming of the third sub-voxel includes recording color data regarding the third color and color data regarding the first color to a third location on the hologram recording material.
Other features and aspects may be apparent from the following detailed description, the drawings, and the claims.
Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience.
The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. Accordingly, various changes, modifications, and equivalents of the systems, apparatuses and/or methods described herein will be suggested to those of ordinary skill in the art. Also, descriptions of well-known functions and constructions may be omitted for increased clarity and conciseness. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
According to the example illustrated in
The first, second, and third sub-voxels 161, 162, and 163 are not limited thereto and may include color data regarding various other colors. Further, in an example of the sub-voxel 2D array configuration, the first, second, and third sub-voxels 161, 162, and 163 adjacent to each other include color data regarding different colors, the second and third sub-voxels 162 and 163 may be arranged around the first sub-voxel 161, whereas the third and first sub-voxels 163 and 161 may be arranged around the second sub-voxel 162. In addition, the first and second sub-voxels 161 and 162 may be arranged around the third sub-voxel 163.
As described above, in the sub-voxel 2D array configuration according to the example illustrated in
In another example, in a case where the sub-voxel 2D array configuration is a dense structure, 3D stereoscopic image data reproduced by the sub-voxel 2D array configuration has motion parallax data similar to that of a 2D image. Therefore, in an example, color of a predetermined location of an actual 3D stereoscopic image is embodied by combining the predetermined first, second, or third sub-voxel 161, 162, or 163 with the adjacent first, second, and/or third sub-voxels 161, 162, and/or 163 corresponding to different colors.
For example, the sub-voxel 2D array configuration in which color data regarding only one color is recorded to each of the first, second, and third sub-voxels 161, 162, and 163 has a modulated refractive index per color that increases, thereby serving to improve diffraction efficiency (DE) of the sub-voxel 2D array configuration and, subsequently, the brightness of a 3D image embodied by the sub-voxel 2D array configuration.
After color data regarding green color of a predetermined location of an actual 3D image is displayed (173) on the SLM 30, the green laser light source 10G emits a green light that passes through the SLM 30 and records (174) color data regarding green color on the hologram recording material 50. Therefore, a green sub-voxel including color data regarding green color (the second sub-voxel 162) is formed on the hologram recording material 50 nearby the red sub-voxel 161. Next, the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a sub-voxel.
After color data regarding blue color of a predetermined location of an actual 3D image is displayed (175) on the SLM 30, the blue laser light source 10B emits a blue light that passes through the SLM 30 and records (176) color data regarding blue color on the hologram recording material 50. Therefore, a blue sub-voxel including color data regarding blue color (the third sub-voxel 163) is formed on the hologram recording material 50 nearby the green sub-voxel 162. Next, the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a sub-voxel, and the above operations are repeatedly performed. As a result, the red, green, and blue sub-voxels 161, 162, and 163 are sequentially and repeatedly formed on the hologram recording material 50. Therefore, a sub-voxel 2D array configuration is formed.
For example, in
Further, in the sub-voxel 2D array configuration as described above, the first, second, and third sub-voxels 261, 262, and 263 adjacent to each other include color data regarding different colors. In an example, the second and third sub-voxels 262 and 263 are arranged around the first sub-voxel 261, whereas the third and first sub-voxels 263 and 261 are arranged around the second sub-voxel 262. Moreover, the first and second sub-voxels 261 and 262 are arranged around the third sub-voxel 263.
As described above, in the sub-voxel 2D array configuration shown in
A method of printing a holographic 3D image configured to form the sub-voxel 2D array configuration according to the example illustrated in
After color data regarding red color of a predetermined location of an actual 3D image is displayed on the SLM 30, the red laser light source 10R emits a red light that passes through the SLM 30 and records color data regarding red color on the hologram recording material 50. After color data regarding green color of a predetermined location of an actual 3D image is displayed on the SLM 30, the green laser light source 10G emits a green light that passes through the SLM 30 and records color data regarding green color on the hologram recording material 50 on which the color data regarding red color is recorded. Therefore, the first sub-voxel 261 including color data regarding red color and color data regarding green color is formed on the hologram recording material 50. Next, the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a sub-voxel.
After color data regarding green color of a predetermined location of an actual 3D image is displayed on the SLM 30, the green laser light source 10G emits a green light that passes through the SLM 30 and records color data regarding green color on the hologram recording material 50. After color data regarding blue color of a predetermined location of an actual 3D image is displayed on the SLM 30, the blue laser light source 10B emits a blue light that passes through the SLM 30 and records color data regarding blue color on the hologram recording material 50 on which the color data regarding green color is recorded. Therefore, the second sub-voxel 262 including color data regarding green color and color data regarding blue color is formed on the hologram recording material 50. Next, the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a sub-voxel.
After color data regarding blue color of a predetermined location of an actual 3D image is displayed on the SLM 30, the blue laser light source 10B emits a blue light that passes through the SLM 30 and records color data regarding blue color on the hologram recording material 50. After color data regarding red color of a predetermined location of an actual 3D image is displayed on the SLM 30, the red laser light source 10R emits a red light emitted that passes through the SLM 30 and records color data regarding red color on the hologram recording material 50 on which the color data regarding red color is recorded. Therefore, the third sub-voxel 263 including color data regarding blue color and color data regarding red color is formed on the hologram recording material 50. Next, after the hologram recording material 50 is moved in the x-axis direction or the y-axis direction by the size of a sub-voxel, and the above operations are repeatedly performed. As a result, the first, second, and third sub-voxels 261, 262, and 263 are sequentially and repeatedly formed on the hologram recording material 50. Therefore, a sub-voxel 2D array configuration is formed. In various examples, the first sub-voxel 261 includes color data regarding red and green colors, the second sub-voxel 262 includes color data regarding green and blue colors, and the third sub-voxel 263 includes color data regarding blue and red colors.
According to the example illustrated in
According to the example illustrated in
In the above examples, while not being limited thereto, a predetermined color is embodied by combining three colors, that is, red, green, and blue. In another example, a predetermined color is embodied by combining four or more colors. Furthermore, in the above examples, the sub-voxel 2D array configuration in which each of the first, second, and third sub-voxels 161, 162, and 163 includes color data regarding only one color or the sub-voxel 2D array configuration in which each of the first, second, and third sub-voxels 261, 262, and 263 includes color data regarding two colors is provided. However, in another example of a single sub-voxel 2D array configuration, each of some of sub-voxels include color data regarding only one color, whereas each of the other sub-voxels include color data regarding two colors.
A number of examples have been described above. Nevertheless, it will be understood that various modifications may be made. For example, suitable results may be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents. Accordingly, other implementations are within the scope of the following claims.
Sung, Gee-Young, Pyun, Kyoung-seok
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